Handle missing pacman in msys2 install_dependencies.sh - #8551
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Look up pacman on PATH and common MSYS2 install locations from Git Bash. If missing, point at the VS helper and msys2.org, and on Windows fall back to scripts/vs/install_dependencies.sh. Default to UCRT64, skip empty MINGW_PACKAGE_PREFIX from the MSYS shell, use --noconfirm (not --confirm), refresh the package DB before install, and pin OpenCV 4 from the ucrt64 repo.
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Problem
On Windows Git Bash this dies immediately:
pacmanonly exists inside an MSYS2 UCRT64/MINGW64/CLANG64 shell. Git Bash, cmd, and PowerShell do not have it, and OF does not need those MinGW packages for a Visual Studio build.Fix
pacmanon PATH, then typical MSYS2 locations (C:\msys64\..., scoop, etc.)MSYSTEM/MINGW_PACKAGE_PREFIXto ucrt64 when unsetscripts/vs/install_dependencies.sh+scripts/vs/download_libs.sh, and on Windows exec the VS helper (gum via winget/scoop) instead of crashingMSYS2 users who already have pacman are unchanged.